12101591 has 2 divisors, whose sum is σ = 12101592.
Its totient is φ = 12101590.
The previous prime is 12101587. The next prime is 12101641. The reversal of 12101591 is 19510121.
It is a weak prime.
It is a cyclic number.
It is not a de Polignac number, because 12101591 - 22 = 12101587 is a prime.
It is a Sophie Germain prime.
It is a congruent number.
It is not a weakly prime, because it can be changed into another prime (12101891) by changing a digit.
It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6050795 + 6050796.
It is an arithmetic number, because the mean of its divisors is an integer number (6050796).
Almost surely, 212101591 is an apocalyptic number.
12101591 is a deficient number, since it is larger than the sum of its proper divisors (1).
12101591 is an equidigital number, since it uses as much as digits as its factorization.
12101591 is an odious number, because the sum of its binary digits is odd.
The product of its (nonzero) digits is 90, while the sum is 20.
The square root of 12101591 is about 3478.7341088390.
The cubic root of 12101591 is about 229.5871042039.
The spelling of 12101591 in words is "twelve million, one hundred one thousand, five hundred ninety-one".